[Gwathagor]

Legate may have been a good choice for Rikae to turn into a werewolf during the Night in question because of how she had gone after him earlier, when she "revealed" as the GW. However, this very fact may also have disqualified him in her mind.

If Rikae was looking for someone who would present themselves as an obvious choice, she may have gone with Legate or Shasta perhaps; Legate, because he's sneaky, and Shasta because he's quiet and has gone relatively unnoticed.

Like I said, though, if I was the EW, I would have scried Roa, because she can get away with being vocal and persuasive without being suspected for it. Or at least has done so this game.